Treehouseworking is, as we've often said here, one of the nicest ways of shedworking. Here's a marvellous design from the Canadian Free Spirit Spheres. The marvellous laminated wood spheres are hung from trees (or other solid objects like buildings or rock faces) with a rope web acting as a kind of foundation - they're waterproof, insulated (with fibreglass) and robust. Here's what they say about the design:
"The concept borrows heavily from sailboat construction and rigging practice. It’s a marriage of tree house and sailboat technology. Wooden spheres are built much like a cedar strip canoe or kayak. Suspension points are similar to the chain plate attachments on a sailboat. Stairways hang from a tree much like a sailboats shrouds hang from the mast."It's a wonderful site to browse around with plenty of photos (including some sphereworking as pictured below) and lots of details about the whys and wherefores including a great FAQ section which has this advice:
"Does it sway much?
The spheres sway gently in the breeze but move much more abruptly when someone inside changes position. Since the tethers are almost vertical, and a sphere is tied to 3 separate trees, the movement of the sphere in the wind is a muted average of the motion of the treetops. However, since the spheres are light (500 kg) when somebody inside moves it jiggles the whole sphere."